Mobile terminal apparatus and method of transmitting an uplink control information signal

ABSTRACT

To suppress and minimize changes from the method of transmitting an uplink control information in the LTE system, while supporting increases in the system band and increases in the transmission layer when there is a PUSCH signal transmitted in the same subframe, provided is a configuration for generating a UCI signal for a base station apparatus ( 20 ) in a mobile communication system having a system band comprised of a plurality of component carriers, multiplexing the UCI signal into a PUSCH signal transmitted in the same subframe as the UCI signal in a user specific component carrier used in transmission of a PUCCH signal, and transmitting the PUSCH signal into which the UCI signal is multiplexed to the base station apparatus ( 20 ).

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a continuation application of and, thereby,claims benefit under 35 U.S.C. §120 to U.S. patent application Ser. No.13/578,910 filed on Aug. 14, 2012, titled, “MOBILE TERMINAL APPARATUSAND METHOD OF TRANSMITTING AN UPLINK CONTROL INFORMATION SIGNAL,” whichis a national stage application of PCT Application No.PCT/JP2011/053081, filed on Feb. 15, 2011, which claims priority toJapanese Patent Application Nos. 2010-030374 and 2010-181684 filed onFeb. 15, 2010 and Aug. 16, 2010, respectively. The contents of thepriority applications are incorporated by reference in their entirety.

TECHNICAL FIELD

The present invention relates to a mobile terminal apparatus and methodof transmitting an uplink control information signal in thenext-generation mobile communication system.

BACKGROUND

In UMTS (Universal Mobile Telecommunications System) networks, for thepurpose of improving spectral efficiency and further improving datarates, by adopting HSDPA (High Speed Downlink Packet Access) and HSUPA(High Speed Uplink Packet Access), it is performed exploiting maximumfeatures of the system based on W-CDMA (Wideband Code Division MultipleAccess). For the UMTS network, for the purpose of further increasinghigh-speed data rates, providing low delay and the like, Long TermEvolution (LTE) has been studied (Non-patent Document 1). In LTE, as amultiplexing scheme, OFDMA (Orthogonal Frequency Division MultipleAccess) different from W-CDMA is used in downlink, while SC-FDMA (SingleCarrier Frequency Division Multiple Access) is used in uplink.

In the 3G system, a fixed band of 5 MHz is substantially used, and it ispossible to achieve transmission rates of approximately maximum 2 Mbpsin downlink. Meanwhile, in the LTE system, using variable bands rangingfrom 1.4 MHz to 20 MHz, it is possible to achieve transmission rates ofmaximum 300 Mbps in downlink and about 75 Mbps in uplink. Further, inthe UMTS network, for the purpose of further increasing the wide-bandand high speed, successor systems to LTE have been studied (for example,LTE Advanced (LTE-A)). Accordingly, it is expected that such a pluralityof mobile communication systems coexists in the future, and it isconceivable that configurations (base station apparatus, mobile terminalapparatus and the like) that support the plurality of systems areneeded.

Non-Patent Literature

[Non-patent Literature 1] 3GPP, TR25.912 (V7.1.0), “Feasibility Studyfor Evolved UTRA and UTRAN”, September 2006

SUMMARY OF INVENTION

The present invention was made in view of such a respect, and it is anobject of the invention to provide a mobile terminal apparatus andmethod of transmitting an uplink control information signal that supporteach of mobile communication systems when a plurality of mobilecommunication systems coexists.

A mobile terminal apparatus of the invention is characterized by havingan uplink control information signal generating section that generatesan uplink control information signal for a base station apparatus in amobile communication system having a system band comprised of aplurality of base frequency blocks, a multiplexing section thatmultiplexes the uplink control information signal into an uplink shareddata channel signal transmitted in the same subframe as the uplinkcontrol information signal in a particular base frequency block used intransmission of an uplink control channel signal, and a transmissionsection that transmits the uplink shared data channel signal into whichthe uplink control information signal is multiplexed to the base stationapparatus.

According to the invention, in a mobile communication system having asystem band comprised of a plurality of base frequency blocks, an uplinkcontrol information signal is multiplexed into an uplink shared datachannel signal transmitted in the same subframe in a particular basefrequency block. Accordingly, in carrier aggregation for aggregating aplurality of base frequency blocks to widen the band, it is possible tocause a plurality of mobile communication systems to coexist whilesuppressing to minimize changes from a method of transmitting an uplinkcontrol information signal of a mobile communication system of a singlebase frequency block.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is an explanatory view of a system band of an LTE system;

FIGS. 2A and 2B contain explanatory views of a method of transmitting aUCI signal in an LTE system (Release-8);

FIGS. 3A and 3B contain explanatory views of a method of transmitting aUCI signal in non-transmission of PUSCH in an LTE-A system;

FIG. 4 is an explanatory view of a configuration of a mobilecommunication system;

FIG. 5 is an explanatory view of the entire configuration of a mobileterminal apparatus;

FIG. 6 is an explanatory view of the entire configuration of a basestation apparatus;

FIG. 7 is a functional block diagram of a baseband signal processingsection that the mobile terminal apparatus has;

FIG. 8 is a functional block diagram of a baseband signal processingsection that the base station apparatus has;

FIGS. 9A, 9B, and 9C contain explanatory views of a first method oftransmitting a UCI signal;

FIGS. 10A, 10B, and 10C contain explanatory views of a second method oftransmitting a UCI signal;

FIG. 11 illustrates an arrangement configuration al UCI signalsmultiplexed into a PUSCH signal;

FIGS. 12A, 12B, and 12C contain explanatory views of transmission powercontrol processing on each component carrier;

FIGS. 13A, 13B, and 13C contain explanatory views of a third method oftransmitting a UCI signal;

FIG. 14 is an explanatory view of a method of transmitting a UCI signalin any of component carriers except a user specific component carrier;

FIG. 15 is another functional block diagram of the baseband signalprocessing section that the mobile terminal apparatus has; and

FIG. 16 is another functional block diagram of the baseband signalprocessing section that the base station apparatus has.

DESCRIPTION OF EMBODIMENTS

FIG. 1 is a diagram to explain a frequency usage state when mobilecommunications are performed in downlink. In addition, in the followingdescriptions, a base frequency block is described as a componentcarrier. The example as shown in FIG. 1 is of the frequency usage statein the case of coexistence of LTE-A systems that are first mobilecommunication systems having first relatively wide system bandscomprised of a plurality of component carriers, and LTE systems that aresecond mobile communication systems having a second relatively narrowsystem band (herein, comprised of a single component carrier). In theLTE-A systems, for example, radio communications are performed with avariable system bandwidth of 100 MHz or less, and in the LTE systems,radio communications are performed with a variable system bandwidth of20 MHz or less. The system band of the LTE-A system is at least one basefrequency region (component carrier: CC) with a system band of the LTEsystem as a unit. Thus aggregating a plurality of base frequency regionsto broaden the band is referred to as carrier aggregation.

For example, in FIG. 1, the system band of the LTE-A system is a systemband (20 MHz×5=100 MHz) containing bands of five component carrierswhere the system band (base band: 20 MHz) of the LTE system is onecomponent carrier. In FIG. 1, a mobile terminal apparatus UE (UserEquipment) #1 is a mobile terminal apparatus supporting the LTE-A system(also supporting the LTE system), and has the system band of 100 MHz,UE#2 is a mobile terminal apparatus supporting the LTE-A system (alsosupporting the LTE system), and has the system band of 40 MHz (20MHz×2=40 MHz), and UE#3 is a mobile terminal apparatus supporting theLTE system (not supporting the LTE-A system), and has the system band of20 MHz (base band).

In addition, in the LTE system (Release-8), a mobile terminal apparatusUE transmits a UCI (Uplink Control Information) signal to a base stationapparatus eNB. The UCI signal is comprised of one or combination of anyof CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI(Rank Indicator), ACK (Acknowledgement), NACK (NegativeAcknowledgement)etc. In this case, as shown in FIG. 2A, when there is no PUSCH (PhysicalUplink Shared Channel) signal transmitted in the same subframe, a UCIsignal is included in a PUCCH (Physical Uplink Control Channel) signaland transmitted. Meanwhile, as shown in FIG. 2B, when there is a PUSCHsignal transmitted in the same subframe, a UCI signal is included in thePUSCH signal and transmitted.

Further, the method of transmitting a UCI signal is also studied in theLTE-A system. As shown in FIG. 3A, in the LTE-A system, in addition tothe fact that the system band is configured using a plurality ofcomponent carriers with the system band of the LTE system as a unit,MIMO multiplexing transmission is supported, and it is not possible touse the method of transmitting a UCI signal in the LTE system withoutmodification. In this case, as shown in FIG. 3B, when there is no PUSCHsignal transmitted in the same subframe, it is conceivable to includethe UCI signal in a PUCCH signal of a user specific (UE-specific)component carrier. However, the still remaining issue is a method oftransmitting a UCI signal when there is a PUSCH signal transmitted inthe same subframe.

Therefore, to solve the problem, the inventors of the invention arrivedat the invention. In other words, it is the gist of the invention tosuppress and minimize changes from the method of transmitting a UCIsignal in the LTE system, while supporting increases in the system bandand increases in the transmission layer when there is a PUSCH signaltransmitted in the same subframe as the UCI signal.

An Embodiment of the invention will specifically be described below withreference to accompanying drawings. Described herein is a configurationfor applying the invention to an LTE-A system, but the invention is notlimited this configuration. The invention is applicable to any mobilecommunication systems as long as the systems are mobile terminal systemsfor transmitting uplink control information signals in uplink, incarrier aggregation for aggregating a plurality of base frequency blocksto widen the band. Herein, an uplink control channel mainly used incontrol of uplink is referred to as a PUCCH, and an uplink shared datachannel mainly used in transmission of user data is referred to as aPUSCH, but the channels are not limited these names.

Referring to FIG. 4, described is a mobile communication system 1 havingmobile terminal apparatuses (UEs) 10 and base station apparatus (Node B)20 according to the Embodiment of the invention. FIG. 4 is a diagram toexplain a configuration of the mobile communication system 1 having themobile terminal apparatuses 10 and base station apparatus 20 accordingto this Embodiment. In addition, as described above, the mobilecommunication system 1 as shown in FIG. 4 is a system including theLTE-A system. LTE-A may be called IMT-Advanced or may be called 4G.

As shown in FIG. 4, the mobile communication system 1 includes the basestation apparatus 20 and a plurality of mobile terminal apparatuses 10(10 ₁, 10 ₂, 10 ₃, . . . , 10 _(n), n is an integer where n>0) thatcommunicate with the base station apparatus 20 and is comprised thereof.The base station apparatus 20 is connected to an upper station apparatus30, and the upper station apparatus 30 is connected to a core network40. The mobile terminal apparatus 10 communicates with the base stationapparatus 20 in a cell 50. In addition, for example, the upper stationapparatus 30 includes an access gateway apparatus, radio networkcontroller (RNC), mobility management entity (MME), etc., but is notlimited thereto.

Each of the mobile terminal apparatuses 10 (10 ₁, 10 ₂, 10 ₃, . . . , 10_(n)) includes an LTE terminal and LTE-A terminal, and is described as amobile terminal apparatus 10 unless otherwise specified in the followingdescription. Further, for convenience in description, the description isgiven while assuming that equipment that performs radio communicationwith the base station apparatus 20 is the mobile terminal apparatus 10,and more generally, the equipment may be user equipment (UE) includingmobile terminal apparatuses and fixed terminal apparatuses.

In the mobile communication system 1, as a radio access scheme, OFDMA(Orthogonal Frequency Division Multiple Access) is applied in downlink,while SC-FDMA (Single-Carrier Frequency Division Multiple Access) isapplied in uplink. OFDMA is a multicarrier transmission scheme fordividing a frequency band into a plurality of narrow frequency bands(subcarriers), and mapping data to each subcarrier to performcommunication. SC-FDMA is a single-carrier transmission scheme fordividing the system band into bands comprised of a single or consecutiveresource blocks for each terminal so that a plurality of terminals usesmutually different bands, and thereby reducing interference among theterminals.

Described herein are communication channels in the LTE system. Indownlink, used are the PDSCH (Physical Downlink Shared Channel) sharedamong the mobile terminal apparatuses 10, the PDCCH (Physical DownlinkControl Channel) that is a control channel in downlink, PCFICH (PhysicalControl Format Indicator Channel) and PHICH (Physical Hybrid-ARQIndicator Channel). The PDSCH is used in transmission of PDSCH signalsmainly including downlink user data, control information of a higherlayer, etc. The PDCCH is used in transmission of PDCCH signals mainlyincluding information of component carriers that the base stationapparatus 20 assigns to mobile terminal apparatuses 10, schedulinginformation, etc.

In uplink, used are the PUSCH shared among the mobile terminalapparatuses 10, and the PUCCH that is a control channel in uplink. ThePUSCH is used in transmission of PUSCH signals (uplink shared datachannel signals) mainly including uplink user data, control informationof the higher layer, etc. The PUCCH is used in transmission of PUCCHsignals (uplink control channel signals) mainly including schedulinginformation, downlink CQI, ACK/NACK, etc. In addition, the PUCCH isassigned radio resources at opposite ends of each component carrier.

Referring to FIG. 5, described next is the entire configuration of themobile terminal apparatus according to this Embodiment. FIG. 5 is theentire configuration diagram of the mobile terminal apparatus accordingto this Embodiment. The mobile terminal apparatus 10 is provided with atransmission/reception antenna 101, amplifying section 102,transmission/reception section 103, baseband signal processing section104 and application section 105.

With respect to data in downlink, a radio frequency signal received inthe transmission/reception antenna 101 is amplified in the amplifyingsection 102, subjected to frequency conversion in thetransmission/reception section 103, and is converted into a basebandsignal. The baseband signal is subjected to Fast Fourier Transform (FFT)processing, error correcting decoding, reception processing ofretransmission control, etc. in the baseband signal processing section104. Among the data in downlink, user data in downlink is transferred tothe application section 105. The application section 105 performsprocessing concerning layers higher than the physical layer and MAClayer and the like. Further, among the data in downlink, broadcastinformation is also transferred to the application section 105.

Meanwhile, the application section 105 inputs user data in uplink to thebaseband signal processing section 104. The baseband signal processingsection 104 performs transmission processing of retransmission control(H-ARQ (Hybrid ARQ)), channel coding, Discrete Fourier Transform (DFT)processing, Inverse Fast Fourier Transform (IFFT) processing, etc. onthe data to transfer to the transmission/reception section 103. Thetransmission/reception section 103 performs frequency conversionprocessing for converting the baseband signal output from the basebandsignal processing section 104 into a signal with a radio frequency band,and then, the signal is amplified in the amplifying section 102, and istransmitted from the transmission/reception antenna 101.

Referring to FIG. 6, described next is the entire configuration of thebase station apparatus according to this Embodiment. FIG. 6 is theentire configuration diagram of the base station apparatus according tothis Embodiment. The base station apparatus 20 is provided with atransmission/reception antenna 201, amplifying section 202,transmission/reception section 203, baseband signal processing section204, call processing section 205 and transmission path interface 206.

The user data in downlink is input to the baseband signal processingsection 204 via the transmission path interface 206 from the upperstation apparatus 30 positioned higher than the base station apparatus20. The baseband signal processing section 204 performs PDCP layerprocessing, segmentation and concatenation of the user data, RLC (RadioLink Control) layer transmission processing such as transmissionprocessing of RLC retransmission control, MAC (MediumAccess Control)retransmission control e.g. transmission processing of HARQ (HybridAutomatic Repeat reQuest), scheduling, transmission format selection,channel coding, Inverse Fast Fourier Transform processing and precodingprocessing.

Further, with respect to the PDCCH signal that is a downlink controlchannel, the transmission processing such as channel coding and InverseFast Fourier Transform is also performed, and the resultant istransferred to the transmission/reception section 203. Furthermore, on abroadcast channel, the baseband signal processing section 204 notifiesthe mobile terminal apparatuses 10 connected in the same cell 50 ofcontrol information for each mobile terminal apparatus 10 to performradio communication with the base station apparatus 20. Thetransmission/reception section 203 performs frequency conversionprocessing for converting the baseband signal output from the basebandsignal processing section 204 into a signal with a radio frequency band,and then, the signal is amplified in the amplifying section 202 andtransmitted from the transmission/reception antenna 201.

Meanwhile, with respect to data in uplink, a radio frequency signalreceived in the transmission/reception antenna 201 is amplified in theamplifying section 202, subjected to frequency conversion in thetransmission/reception section 203, thereby converted into a basebandsignal, and is input to the baseband signal processing section 204. Thebaseband signal processing section 204 performs Fast Fourier Transformprocessing, Inverse Discrete Fourier Transform (IDFT) processing, errorcorrecting decoding, reception processing of MAC retransmission control,and reception processing of RLC layer and PDCP layer on the user dataincluded in the input baseband signal, and transfers the resultant tothe upper station apparatus 30 via the transmission path interface 206.The call processing section 205 performs call processing such as settingand release of the communication channel, status management of the basestation apparatus 20, and management of radio resources.

Referring to FIG. 7, described is the functional configuration of thebaseband signal processing section that the mobile terminal apparatushas according to this Embodiment. FIG. 7 is a functional block diagramof the baseband signal processing section that the mobile terminalapparatus has according to this Embodiment. In addition, in FIG. 7,described is an uplink configuration for the mobile terminal apparatusto transmit transmission signals to the base station apparatus. Further,FIG. 7 exemplifies the mobile terminal configuration that supports amobile communication system with N component carriers (CC#1 to CC#N),and describes the configuration for performing transmission using twotransmission layers.

As shown in FIG. 7, the baseband signal processing section 104 isprovided with a UCI signal generating section 301, path switchingsection 302, PUCCH signal generating section 303, DFT sections 304, andPUCCH mapping sections 305. The UCI signal generating section 301generates a UCI signal to input to the path switching section 302. TheUCI signal is comprised of one or combination of any of CQI, PMI, RI,ACK, NACK, etc.

The path switching section 302 switches a signal path of the UCI signalcorresponding to the presence or absence of the PUSCH signal in a userspecific (UE-specific) component carrier. The user specific componentcarrier indicates a component carrier that is assigned for each user andthat is used in transmission of the PUCCH signal. In the followingdescription, the description is given assuming that the user specificcomponent carrier is a component carrier #1.

When the PUSCH signal is not transmitted in the same subframe as the UCIsignal in the component carrier #1, the path switching section 301switches an input destination of the UCI signal to the PUCCH signalgenerating section 303. Meanwhile, when the PUSCH signal is transmittedin the same subframe as the UCI signal in the component carrier #1, thepath switching section 302 switches an input destination of the UCIsignal to a PUSCH signal generating section 307 of the component carrier#1.

In addition, the path switching section 302 may switch the inputdestination of the UCI signal to the PUSCH signal generating section 307of a single transmission layer of the component carrier #1 or PUSCHsignal generating sections 307 of all transmission layers of thecomponent carrier #1.

Further, the path switching section 302 may be configured to enable thesection 302 to switch the input destination of the UCI signal betweenthe PUSCH signal generating section 307 of a single transmission layerof the component carrier #1 and the PUSCH signal generating sections 307of all transmission layers of the component carrier #1, when the PUSCHsignal is transmitted in the same subframe as the UCI signal. In thiscase, the path switching section 302 is capable of switching the inputdestination corresponding to the signal type of the UCI signal. Forexample, for the UCI signal such as ACK, NACK and RI requiring thequality, the path switching section 302 switches the input destinationto the PUSCH signal generating sections 307 of all transmission layersof the component carrier #1, and for remaining CQI and PMI, switches tothe PUSCH signal generating section 307 of a first layer of thecomponent carrier #1. In addition, the path switching section 302 is notlimited to the configuration for switching corresponding to the signaltype of the UCI signal as described above, and may be a switchableconfiguration corresponding to other predetermined conditions such as achange in the communication environment or the like.

The PUCCH signal generating section 303 generates a PUCCH signal, andprovides the PUCCH signal with an error correcting code, whilemodulating the coded PUCCH signal for each of a plurality ofsubcarriers. Further, when the UCI signal is input from the pathswitching section 302, the PUCCH signal generating section 303multiplexes the UCI signal into the PUCCH signal. The PUCCH signalgenerating section 303 inputs the modulated PUCCH signal to the DFTsection 304. The DFT section 304 performs discrete Fourier transform onthe coded/modulated PUCCH signal, thereby transforms the time-seriessignal into the signal in the frequency domain, and inputs thetransformed PUCCH signal to the PUCCH mapping section 305. The PUCCHmapping section 305 maps the DFT-processed PUCCH signal to radioresources.

Further, the baseband signal processing section 104 is provided withtransmission data signal generating sections 306, PUSCH signalgenerating sections 307, DFT sections 308, and PUSCH mapping sections309 for each component carrier. The transmission data signal generatingsection 306 generates an uplink transmission data signal including userdata and the like using data delivered from the higher layer for eachtransmission layer, and inputs the transmission data signal to the PUSCHsignal generating section 307.

The PUSCH signal generating section 307 generates a PUSCH signal foreach transmission layer based on the transmission data signal, andprovides the PUSCH signal with an error correcting code, whilemodulating the coded PUSCH signal for each of a plurality ofsubcarriers. Further, when the UCI signal is input from the pathswitching section 302, the PUSCH signal generating section 307multiplexes the transmission data signal and the UCI signal to generatea PUSCH signal. Furthermore, the PUSCH signal generating sections 307control transmission power of the PUSCH signal, and control totaltransmission power of PUSCH signals transmitted in all componentcarriers to within specified transmission power. The PUSCH signalgenerating section 307 inputs the coded/modulated PUSCH signal to theDFT section 308.

The DFT section 308 performs discrete Fourier transform on thecoded/modulated PUSCH signal, thereby transforms the time-series signalinto the signal in the frequency domain, and inputs the transformedPUSCH signal to the PUSCH mapping section 309. The PUSCH mapping section309 maps the DFT-processed PUSCH signal to radio resources of eachtransmission layer.

Uplink channel signals output from the PUCCH mapping sections 305 andPUSCH mapping sections 309 are input to the IFFT section 311. The IFFTsection 311 performs inverse fast Fourier transform on the uplinkchannel signals, thereby transforms the signals in the frequency domaininto the time-series signal, and inputs the signal to the CP addingsection 312. In addition, the IFFT section 311 may be configurationsprovided independently for each component carrier. The CP adding section312 inserts a cyclic prefix in the time-series signal of the uplinkchannel signal. In addition, the cyclic prefix functions as a guardinterval to absorb the difference in multipath propagation delay. Theuplink channel signal provided with the cyclic prefix is output to thetransmission/reception section 103.

Thus, when the PUSCH signal is not transmitted in the same subframe asthe UCI signal in the component carrier #1, the mobile terminalapparatus 10 multiplexes the UCI signal into the PUCCH signal totransmit to the base station apparatus 20. Meanwhile, when the PUSCHsignal is transmitted in the same subframe as the UCI signal in thecomponent carrier #1, the mobile terminal apparatus 10 multiplexes theUCI signal into the PUSCH signal to transmit to the base stationapparatus 20.

Referring to FIG. 8, described is the functional configuration of thebaseband signal processing section that the base station apparatus hasaccording to this Embodiment. FIG. 8 is a functional block diagram ofthe baseband signal processing section that the base station apparatushas according to this Embodiment. In addition, in FIG. 8, described isan uplink configuration for the mobile terminal apparatus to transmittransmission signals to the base station apparatus. Further, FIG. 8exemplifies the base station configuration that supports the mobilecommunication system with N component carriers (CC#1 to CC#N), anddescribes the configuration for performing transmission using twotransmission layers.

As shown in FIG. 8, the baseband signal processing section 204 isprovided with CP removing sections 401, FFT section 402, PUCCH demappingsections 403, IDFT sections 404, PUCCH demodulation section 405, pathswitching section 406, and UCI decoding section 407. The CP removingsection 401 removes a cyclic prefix from an uplink channel signal toinput to the FFT section 402. The FFT section 402 performs fast Fouriertransform on the CP-removed uplink channel signal, and therebytransforms the time-series signal into the signal in the frequencydomain. In addition, the FFT section 402 may be configurations providedindependently for each component carrier.

The PUCCH demapping section 403 retrieves the PUCCH signal mapped toradio resources for each transmission layer to input to the IDFT section404. The IDFT section 404 performs inverse discrete Fourier transform onthe PUCCH signal input from the PUCCH demapping section 403, therebytransforms the signal in the frequency domain into the time-seriessignal, and inputs the transformed PUCCH signal to the PUCCHdemodulation section 405.

The PUCCH demodulation section 405 demodulates the PUCCH signal inputfrom the IDFT section 404 for each of a plurality of subcarriers. Atthis point, when a PUSCH signal is not transmitted in the componentcarrier #1, the UCI signal is multiplexed into the PUCCH signal. Whenthe UCI signal is multiplexed into the PUCCH signal, the PUCCH signaldemodulation section 405 inputs the UCI signal to the path switchingsection 406. When the UCI signal is multiplexed into the PUCCH signal,the path switching section 406 inputs the UCI signal to the UCI decodingsection 407. The UCI decoding section 407 decodes the UCI signal.

Further, the baseband signal processing section 204 is provided withPUSCH demapping sections 408, equalization/signal division processingsections 409, IDFT sections 411, 412, and transmission data signaldemodulation/decoding sections 413. The PUSCH demapping sections 408retrieve the PUSCH signals mapped to radio resources for eachtransmission layer to input to the equalization/signal divisionprocessing sections 409. The equalization/signal division processingsection 409 removes distortion of the phase and amplitude of eachsubcarrier from the PUSCH signal. Further, when the UCI signal ismultiplexed into the PUSCH signal, the equalization/signal divisionprocessing section 409 of the component carrier #1 divides into thetransmission data signal and the UCI signal.

The IDFT section 411 performs inverse discrete Fourier transform on theUCI signal divided in the equalization/signal division processingsection 409, thereby transforms the signal in the frequency domain intothe time-series signal, and inputs the transformed UCI signal to the UCIdecoding section 407 via the path switching section 406. The UCIdecoding section 407 decodes the UCI signal.

The IDFT section 412 performs inverse discrete Fourier transform on thetransmission data signal divided in the equalization/signal divisionprocessing section 409, thereby transforms the signal in the frequencydomain into the time-series signal, and inputs the transformedtransmission data signal to the transmission data signaldemodulation/decoding section 413. The transmission data signaldemodulation/decoding section 413 demodulates the transmission data foreach of a plurality of subcarriers, while decoding the demodulatedtransmission data signal. The transmission data signaldemodulation/decoding section 413 inputs the decoded transmission datasignal to the propagation path interface 206.

Thus, when the PUSCH signal is not transmitted in the same subframe asthe UCI signal from the mobile terminal apparatus 10, the base stationapparatus 20 acquires the UCI signal via the PUCCH signal. Meanwhile,when the PUSCH signal is transmitted in the same subframe as the UCIsignal from the mobile terminal apparatus 10, the base station apparatus20 acquires the UCI signal via the PUSCH signal of the component carrier#1.

The method of transmitting the UCI signal will be described withreference to FIGS. 9 to 11 and 13. FIG. 9 is an explanatory view of thefirst method of transmitting the UCI signal. FIG. 10 is an explanatoryview of the second method of transmitting the UCI signal. FIG. 11illustrates an arrangement configuration of UCI signals multiplexed intoa PUSCH signal. FIG. 13 is an explanatory view of the third method oftransmitting the UCI signal. In addition, in the first to thirdtransmission methods, the method of transmitting the UCI signal when theUCI signal and the PUSCH signal are not transmitted in the subframe isdescribed above, and is omitted (see FIG. 3B). Further, FIGS. 9, 10 and13 exemplify one-layer transmission and two-layer transmission todescribe, but the number of transmission layers is not limited, and theinvention is applicable to multi-layer transmission of three layers ormore.

As shown in FIG. 9A, in one-layer transmission in the first transmissionmethod, in the case of transmitting the PUSCH signal in the samesubframe as the UCI signal, the mobile terminal apparatus 10 multiplexesthe UCI signal into the PUSCH signal of the user specific componentcarrier to transmit to the base station apparatus 20. For example, inthe case of transmitting the PUSCH signal in component carriers #1 to#3, the mobile terminal apparatus 10 multiplexes the UCI signal into thePUSCH signal of the user specific component carrier #1 assigned thePUCCH signal.

As shown in FIG. 11, the UCI signal multiplexed into the PUSCH signal ismultiplexed into the same symbol as the transmission data signal. Forexample, when the CQI, PMI, RI, ACK or NACK is transmitted as the UCIsignal, the CQI and PMI are arranged in on the low band side of thetransmission data signal, and the RI, ACK and NACK are arranged on thehigh band side of the transmission data signal. In addition, thearrangement configuration of the UCI signals of FIG. 11 is only anexample, and the invention is not limited to this configuration. It ispossible to adopt any arrangement configurations in which the UCI signalis arranged inside the PUSCH.

As shown in FIG. 9B, when the PUSCH signal is transmitted in the samesubframe as the UCI signal in a component carrier except the userspecific component carrier, the mobile terminal apparatus 10 multiplexesthe UCI signal into the PUCCH signal to transmit to the base stationapparatus 20. For example, in the case of transmitting the PUSCH signalin component carriers #2 and #3, the mobile terminal apparatus 10multiplexes the UCI signal into the PUCCH signal transmitted in the userspecific component carrier #1.

As shown in FIG. 9C, in multilayer transmission in the firsttransmission method, in the case of transmitting the PUSCH signal in thesame subframe as the UCI signal, the mobile terminal apparatus 10multiplexes the UCI signal into PUSCH signals in all transmission layersof the user specific component carrier to transmit to the base stationapparatus 20. For example, in the case of transmitting the PUSCH signalin two transmission layers of each of component carriers #1 to #3, themobile terminal apparatus 10 duplicates the UCI signal to multiplex intothe PUSCH signal of the first layer of the user specific componentcarrier #1, and multiplexes the signal into the second layer of the userspecific component carrier #1.

In addition, the mobile terminal apparatus 10 may be configuration formapping while decreasing the coding rate, instead of simply duplicatingthe UCI signal. In this case, the mobile terminal apparatus 10 decreasesthe coding rate to ½, codes the UCI signal repeatedly, and therebymultiplexes into the PUSCH signals transmitted in two layers of thecomponent carrier CC#1.

Further, inter-transmission layer transmission diversity may be appliedin in multilayer transmission. As a transmission diversity method, it isconceivable to apply a PVS (Precoding Vector Switching) method, SD-CCD(Small Delay Cyclic Delay Diversity) method, etc. By this means,transmission diversity is applied between transmission/receptionantennas of each transmission layer, and it is possible to increase thequality of the reception level of the UCI signal transmitted in eachtransmission layer.

As shown in FIGS. 10A and 10B, one-layer transmission in the secondtransmission method is the same as one-layer transmission in the firsttransmission method as described above. In other words, in the case oftransmitting the PUSCH signal in the same subframe as the UCI signal,the mobile terminal apparatus 10 multiplexes the UCI signal into thePUSCH signal of the user specific component carrier to transmit to thebase station apparatus 20. Meanwhile, when the PUSCH signal istransmitted in the same subframe as the UCI signal in a componentcarrier except the user specific component carrier, the mobile terminalapparatus 10 multiplexes the UCI signal into the PUCCH signal totransmit to the base station apparatus 20.

As shown in FIG. 10C, in multilayer transmission in the secondtransmission method, in the case of transmitting the PUSCH signal in thesame subframe as the UCI signal, the mobile terminal apparatus 10multiplexes the UCI signal into the PUSCH signal of the first layer ofthe user specific component carrier to transmit to the base stationapparatus 20. For example, in the case of transmitting the PUSCH signalin two layers of each of component carriers #1 to #3, the mobileterminal apparatus 10 multiplexes the UCI signal into the PUSCH signalof the first layer of the user specific component carrier #1. In otherwords, in multilayer transmission of the second transmission method,duplication of the UCI signal is not performed between transmissionlayers.

In addition, in multilayer transmission of the second transmissionmethod, it is necessary that the base station apparatus 20 performs MIMOsignal division processing on the UCI signal. This is because the UCIsignal is transmitted in only one transmission layer among a pluralityof transmission layers and the UCI signal and transmission data signalsor the like of the other transmission layers are thereby spatiallymultiplexed. Meanwhile, in multilayer transmission in the firsttransmission method, since the UCI signal is transmitted in all thetransmission layers, it is possible to extract only the UCI signal, andit is not necessary to perform the MIMO signal division processing onthe UCI signal. For example, the MIMO signal division processing isperformed in the equalization/signal division processing sections 409 ofthe base station apparatus 20.

As shown in FIGS. 13A and 13B, one-layer transmission in the thirdtransmission method is the same as one-layer transmission in the firsttransmission method as described above. In other words, in the case oftransmitting the PUSCH signal in the same subframe as the UCI signal,the mobile terminal apparatus 10 multiplexes the UCI signal into thePUSCH signal of the user specific component carrier to transmit to thebase station apparatus 20. Meanwhile, when the PUSCH signal istransmitted in the same subframe as the UCI signal in a componentcarrier except the user specific component carrier, the mobile terminalapparatus 10 multiplexes the UCI signal into the PUCCH signal totransmit to the base station apparatus 20.

As shown in FIG. 13C, in multilayer transmission in the thirdtransmission method, the above-mentioned first transmission method andsecond transmission method are used properly corresponding topredetermined conditions. For example, in multilayer transmission in thethird transmission method, when the PUSCH signal is transmitted in thesame subframe as the UCI signal, corresponding to the signal type of theUCI signal, the mobile terminal apparatus 10 multiplexes the UCI signalinto the PUSCH signal of the first layer, or PUSCH signals of alltransmission layers of the user specific component carrier to transmitto the base station apparatus 20.

For example, in the case of transmitting the PUSCH signal in twotransmission layers of each of component carriers #1 to #3, the mobileterminal apparatus 10 multiplexes the UCI signal such as ACK, NACK andRI requiring high quality to PUSCH signals of all layers of the userspecific component carrier #1. Meanwhile, the mobile terminal apparatus10 multiplexes the remaining UCI signal such as CQI and PMI into thePUSCH signal of the first layer of the user specific component carrier#1.

In this case, the mobile terminal apparatus 10 duplicates ACK, NACK orRI from the UCI signal of the first layer of the user specific componentcarrier #1 to multiplex into the PUSCH signal of the second layer of thecomponent carrier #1. In other words, in this transmission method,duplication of the CQI and PMI is not performed between transmissionlayers. In this way, it is possible to improve reliability of the UCIsignal requiring high quality by using the first transmission method,while decreasing overhead by using the second transmission method in theother UCI signals.

In addition, described herein is the configuration for using the firsttransmission method in ACK, NACK and RI, while using the secondtransmission method in the CQI and PMI, but the invention is not limitedto this configuration. It is essential only that the third transmissionmethod is to switch the transmission layer to multiplex the UCI signalin the user specific component carrier corresponding to the signal typeof the UCI signal. For example, the CQI and PMI may be multiplexed intoall PUSCH signals of the user specific component carrier #1, and ACK,NACK and RI may be multiplexed into the PUSCH signal of the first layerof the user specific component carrier #1.

Further, in the third transmission method, as well as the signal type ofthe UCI signal, it is also possible to use the first transmission methodand the second transmission method properly corresponding topredetermined conditions such as apparatus performance, time zone and achange in the communication environment. Furthermore, in the thirdtransmission method, it is also possible to use the first transmissionmethod and the second transmission method properly by a change insetting by the user or instructions from the base station apparatus 20.

The above-mentioned first, second and third transmission methods adoptthe configuration in which the mobile terminal apparatus 10 multiplexesthe UCI signal into the PUCCH signal to transmit to the base stationapparatus 20 when the PUSCH signal is transmitted in the same subframeas the UCI signal in a component carrier except the user specificcomponent carrier, but are not limited to this configuration. As shownin FIG. 14, such a configuration may be adopted that the mobile terminalapparatus 10 multiplexes the UCI signal into the PUSCH signal in any ofcomponent carriers except the user specific component carrier totransmit to the base station apparatus 20.

For example, the mobile terminal apparatus 10 duplicates the UCI signalgenerated for the PUSCH signal of the user specific component carrier #1to multiplex into the PUSCH signal of the component carrier #2 or thecomponent carrier #3. In this case, the mobile terminal apparatus 10 maypreferentially select a carrier large in the payload size, carrier largein the assigned resource block size, carrier good in SINR, carrier oflow frequencies with few propagation path errors and the like, or mayset priorities of component carriers beforehand. Alternatively, thecarrier may be notified by RRC signaling or the like.

When the mobile terminal apparatus 10 multiplexes the UCI signal intothe PUSCH signal in any of component carriers except the user specificcomponent carrier, the functional blocks of the baseband signalprocessing section 104 of the mobile terminal apparatus 10 are as shownin FIG. 15. FIG. 15 is another functional block diagram of the basebandsignal processing section that the mobile terminal apparatus hasaccording to this Embodiment. In addition, FIG. 15 is the same as FIG. 7except the configuration of the path switching section. Accordingly, thedescription is omitted in same configuration as in FIG. 7, and thedifference is only described.

A path switching section 502 switches a signal path of the UCI signalcorresponding to the presence or absence of the PUSCH signal in eachcomponent carrier. When the UCI signal and the PUSCH signal are nottransmitted in the same subframe, the path switching section 502switches an input destination of the UCI signal to a PUCCH signalgenerating section 503. Meanwhile, when the PUSCH signal is transmittedin the same subframe as the UCI signal in the user specific componentcarrier #1, the path switching section 502 switches an input destinationof the UCI signal to a PUSCH signal generating section 507 of thecomponent carrier #1.

Further, when the PUSCH signal is not transmitted in the same subframeas the UCI signal in the component carrier #1, and is transmitted in thesame subframe as the UCI signal in another component carrier, the pathswitching section 502 switches a transmission destination of the UCIsignal to a PUSCH signal generating section 507 of any of componentcarriers except the component carrier #1. At this point, the pathswitching section 502 switches the input destination of the UCI signalin the component carrier except the component carrier #1, correspondingto the payload size, the assigned resource block size, SINR, priority orthe like.

Moreover, when the mobile terminal apparatus 10 multiplexes the UCIsignal into the PUSCH signal in any of component carriers except theuser specific component carrier, the functional blocks of the basebandsignal processing section 204 of the base station apparatus 20 are asshown in FIG. 16. FIG. 16 is another functional block diagram of thebaseband signal processing section that the base station apparatus hasaccording to this Embodiment. In addition, FIG. 16 differs from FIG. 8in the configuration for acquiring the UCI signal from not only the userspecific component carrier but also another component carrier.Accordingly, the description is omitted in the same configuration as inFIG. 8, and the difference is only described.

As described above, when the UCI signal and the PUSCH signal are nottransmitted in the same subframe, the UCI signal is multiplexed into thePUCCH signal. The UCI signal multiplexed into the PUCCH signal isextracted in a PUCCH demodulation section 605, and is input to a UCIdecoding section 607 via a path switching section 606.

Meanwhile, when the PUSCH signal is transmitted in the same subframe asthe UCI signal in the user specific component carrier #1, the UCI signalis multiplexed into the PUSCH signal of the component carrier #1. TheUCI signal is divided from the transmission data in anequalization/signal division processing section 609 of the componentcarrier #1, and is input to the UCI signal decoding section 607 via anIDFT section 611 and the path switching section 606.

Further, when the PUSCH signal is not transmitted in the same subframeas the UCI signal in the component carrier #1, and is transmitted in thesame subframe as the UCI signal in another component carrier, the UCIsignal is multiplexed into the PUSCH signal of any of the othercomponent carriers. The UCI signal is divided from the transmission datain an equalization/signal division processing section 609 of any of theother component carriers, and is input to the UCI signal decodingsection 607 via the IDFT section 611 and the path switching section 606.

In the above-mentioned first, second and third transmission methods ofthe UCI signal, total transmission power of PUSCH signals transmitted inrespective component carriers is controlled to be within specifiedtransmission power beforehand set on each mobile terminal apparatus. Thetransmission power control processing on each component carrier will bedescribed below with reference to FIG. 12. FIG. 12 contains explanatoryviews of the transmission power control processing on each componentcarrier. In addition, FIG. 12 describes an example in which thetransmission power control processing is applied to one-layertransmission, but the transmission power control processing isapplicable to multilayer transmission.

As shown in FIG. 12A, when the specified transmission power (area) shownby dashed lines has an allowance with respect to the total transmissionpower (area) of respective component carriers, all component carriersare transmitted with desired transmission power.

As shown in FIG. 12B, when the specified transmission power is lowerthan the total transmission power of respective component carriers andthe total transmission power exceeds the specified transmission power,the total transmission power is controlled to be within the specifiedtransmission power. In this case, transmission power is reduced fromcomponent carriers except the user specific component carrier. In otherwords, transmission power is preferentially allocated to the userspecific component carrier in which the UCI signal is transmitted.

As shown in FIG. 12C, when the specified transmission power is severerwith respect to the total transmission power of respective componentcarriers, transmission power is only allocated to the user specificcomponent carrier. In this case, transmission power of componentcarriers except the user specific component carrier is set at minimumvalues, and transmission power of the user specific component carrier isreduced. In other words, when the total transmission power exceeds thespecified transmission power even by setting transmission power of theother component carriers at minimum values, transmission power of theuser specific component carrier is reduced. In addition, herein, theminimum values of transmission power of the other component carriers areset at “0”, but the value may be “0” or more as long as the value is theminimum value.

Thus, in the first and second transmission methods of the UCI signal,since the UCI signal is transmitted in only the user specific componentcarrier, transmission power of the user specific component carrier ispreferentially maintained. By this means, it is possible to ensuretransmission of the UCI signal within the specified transmission power,while supporting increases in the system band and increases in thetransmission layer. In addition, such a configuration is adopted thatthe transmission power control processing is performed in the PUSCHsignal generating sections 307 provided for each component carrier, butthe invention is not limited to the configuration. A control section maybe newly provided that totally controls transmission power of aplurality of component carriers.

As described above, according to the mobile terminal apparatus 10according to this Embodiment, in the mobile communication system of thesystem band comprised of a plurality of component carriers, the UCIsignal is multiplexed into the PUSCH signal transmitted in the samesubframe in the user specific component carrier used in transmission ofthe PUCCH. Accordingly, in LTE-A for aggregating a plurality ofcomponent carriers to broaden the band, it is possible to suppress andminimize changes from the method of transmitting the UCI signal of theLTE system.

In addition, the above-mentioned Embodiment adopts the configurationthat the UCI signal is multiplexed into the PUSCH signal of the firstlayer in multilayer transmission of the second transmission method, butthe invention is not limited to this configuration. Such a configurationmay be adopted that the UCI signal is multiplexed into the PUSCH signalof a second or subsequent layer. Further, also in multilayertransmission of the third transmission method, in the case of using thesecond transmission method, such a configuration may be adopted that theUCI signal is multiplexed into the PUSCH signal of a second orsubsequent layer.

Further, in the above-mentioned Embodiment, the path switching sectionof the mobile terminal apparatus switches the input destination of theUCI signal, based on the presence or absence of the PUSCH signaltransmitted in the user specific component carrier in the same subframeas the UCI signal. In this case, it is essential only that the pathswitching section is of a configuration that the presence or absence ofthe PUSCH signal is notified from any part of the mobile terminalapparatus, and the path switching section may be a configuration ofbeing notified from the PUSCH signal generating section of the userspecific component carrier.

Furthermore, in the above-mentioned Embodiment, the mobile terminalapparatus is of the configuration for setting transmission power of theother component carriers at “0” and then reducing transmission power ofthe user specific component carrier, but is not limited to theconfiguration. The mobile terminal apparatus may be of anyconfiguration, as long as the configuration is to maintain transmissionpower of the user specific component carrier at a higher level thantransmission power of the other component carriers, while controllingthe total transmission power to within the specified transmission power.

Still furthermore, in the above-mentioned Embodiment, the mobileterminal apparatus is of the configuration for multiplexing the UCIsignal into only the PUSCH signal in the case of transmitting the PUSCHsignal in the same subframe as the UCI signal, but may be of aconfiguration for multiplexing the UCI signal to both the PUSCH signaland the PUCCH signal.

Moreover, in the above-mentioned Embodiment, as an example of the thirdtransmission method, the path switching section of the mobile terminalapparatus switches corresponding to the signal type of the UCI signal.In this case, it is essential only that the path switching section is ofthe configuration of being notified of the signal type of the UCI signalfrom any part of the mobile terminal apparatus, and for example, thepath switching section may be a configuration of being notified from theUCI signal generating section. Further, also when the path of the pathswitching section is switched according to conditions of a change in thecommunication environment or the like, any part of the mobile terminalapparatus notifies the path switching section of various conditions.

Further, in the above-mentioned Embodiment, in the case of multiplexingthe UCI signal into the PUSCH signal in any of component carriers exceptthe user specific component carrier, the path switching section isswitched according to the priorities corresponding to the resource blocksize, SINR, carrier frequency and the like. In this case, it isessential only that the path switching section is of a configuration ofbeing notified of the priorities from any part of the mobile terminalapparatus.

The present invention is not limited to the above-mentioned Embodiment,and is capable of being carried into practice with various modificationsthereof. For example, without departing from the scope of the invention,assignment of component carriers, the number of processing sections,processing procedures, the number of component carriers, and the numberof aggregated component carriers are capable of being carried intopractice with modifications thereof as appropriate. Further, theinvention is capable of being carried into practice with modificationsthereof as appropriate without departing from the scope of theinvention.

The present application is based on Japanese Patent Application No.2010-030374 filed on Feb. 15, 2010 and Japanese Patent Application No.2010-181684 filed on Aug. 16, 2010, entire contents of which areexpressly incorporated by reference herein.

The invention claimed is:
 1. A mobile terminal apparatus that performsradio communication with a base station apparatus via one or morecomponent carriers in a mobile communication system having a system bandconfigurable of a plurality of component carriers, the mobile terminalapparatus comprising: a multiplexing section configured to, when aplurality of component carriers are configured for uplink, multiplex anuplink control information signal to any of the component carriers; atransmission power control section configured to control totaltransmission power of the component carriers to be within specifiedtransmission power, a transmission section configured to transmit anuplink signal to the base station apparatus via the component carriersconfigured for the uplink, wherein, when the total transmission powerexceeds the specified transmission power, the transmission power controlsection maintains desired transmission power of the component carrier towhich the uplink control information signal is multiplexed and reducestransmission power of one or more other component carriers uniformlyfrom desired transmission power so as to control the total transmissionpower not to exceed the specified transmission power, and when thetransmission power of the one or more other component carriers is set to0 and the total transmission power still exceeds the specifiedtransmission power, the transmission power control section reducestransmission power of the component carrier to which the uplink controlinformation signal is multiplexed.
 2. A mobile communication systemcomprising a base station apparatus and a mobile terminal apparatus thatperforms radio communication with the base station apparatus via one ormore component carriers, the mobile communication system having a systemband configurable of a plurality of component carriers, the mobileterminal apparatus having: a multiplexing section configured to, when aplurality of component carriers are configured for uplink, multiplex anuplink control information signal to any of the component carriers; atransmission power control section configured to control totaltransmission power of the component carriers to be within specifiedtransmission power, a transmission section configured to transmit anuplink signal to the base station apparatus via the component carriersconfigured for the uplink, wherein, when the total transmission powerexceeds the specified transmission power, the transmission power controlsection maintains desired transmission power of the component carrier towhich the uplink control information signal is multiplexed and reducestransmission power of one or more other component carriers uniformlyfrom desired transmission power so as to control the total transmissionpower not to exceed the specified transmission power, and when thetransmission power of the one or more other component carriers is set to0 and the total transmission power still exceeds the specifiedtransmission power, the transmission power control section reducestransmission power of the component carrier to which the uplink controlinformation signal is multiplexed.
 3. A transmission method in a mobileterminal apparatus that performs radio communication with a base stationapparatus via one or more component carriers, the transmission methodcomprising the steps of: when a plurality of component carriers areconfigured for uplink, multiplexing an uplink control information signalto any of the component carriers; controlling total transmission powerof the component carriers to be within specified transmission power,transmitting an uplink signal to the base station apparatus via thecomponent carriers configured for the uplink, wherein, when the totaltransmission power exceeds the specified transmission power, desiredtransmission power is maintained for the component carrier to which theuplink control information signal is multiplexed, and transmission powerof one or more other component carriers is reduced uniformly fromdesired transmission power so as to control the total transmission powernot to exceed the specified transmission power, and when thetransmission power of the one or more other component carriers is set to0 and the total transmission power still exceeds the specifiedtransmission power, transmission power of the component carrier to whichthe uplink control information signal is multiplexed is reduced.